Code Definition

P1199 — Fuel Level Input Circuit Low

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Generic

About P1199

P1199 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1199 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1199 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This code relates to the fuel level sensor, or sender unit, input to the engine control module. The fuel level sender is a variable resistor in the fuel tank whose signal voltage changes with float position, and the module uses this input for the fuel gauge and for functions such as EVAP leak testing on petrol engines or low fuel protection strategies on diesels. DTC P1199 is set when the module detects that the fuel level input signal voltage has fallen below the normal operating range, indicating a circuit low or short to ground condition. This is commonly caused by a shorted signal wire, a ...

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